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Contact Us |
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E-mail:sales@abp.net.cn
E-mail:info@abp.net.cn
Tel:+86-755-26054178
Tel:+86-755-26406742
Tel:+86-755-26426045
Tel:+86-755-26068477
ext.822\ 823\ 824\ 804\
817\ 818\ 819
Fax:0086-755-26435488
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Lead Free:
Where We Are And Where We're Going |
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It is important that our circuit boards be not only lead
free but also RoHS complaint. This means that the printed
circuit boards we produce must also meet the restricted RoHS
concentration levels for mercury, cadmium, hexavalent chromium,
polybrominated biphenyls and polybromiated diphenyl ethers.
Advanced Circuits is continuing to gather information and data surrounding the
various lead free solder alloys, and we are looking for a final solder finish
that will provide an acceptable and workable surface for all concerned. It is
not Advanced Circuits' intent to replace the current tin lead solder process
at this time, but to run it in tandem with a lead free process until the use
of leaded solder becomes untenable.
RoHS Compliant
Currently any printed circuit board that we produce does not contain any mercury,
cadmium, hexavalent chromium, polybrominated biphenyls or polybrominated diphenyl
ethers.
Products we produce that are not processed through hot air solder level for a
final finish will currently meet RoHS' no lead restriction. These products would
include those that have electroless nickel immersion gold, electroplated gold,
white tin or finishes other than tin-lead solder.
Laminates
Although we can supply you with a RoHS compliant board today, there would be
laminate-based assembly limitations in exposure to high temperatures. It is important
to keep in mind that some no lead assembly processes will require the laminate
base material to withstand temperatures in excess of 260 degrees C or 500 degrees
F. To resolve this, we are adding new high-temperature laminates to our inventory
so that our customers will be able to meet the higher temp cycling requirements
for some lead free assembly applications.
Advanced Circuits has submitted samples of high-temperature Isola, Polyclad and
Nelco laminates to Underwritters Laboratory for testing and certification. We
are anticipating for this testing to be complete in at least six to eight weeks.
Lead Free Solder
Advanced Circuits has purchased a new HASL machine that will be used only in
the lead free solder process. Once this new unit is installed in the summer of
2005, we will begin producing printed circuit board runs with a lead free solder
plating finish.
Advanced Circuits has not determined the exact lead free solder that will be
used on our RoHS complaint PCBs although the current favorite is an alloy of
tin and copper. This lead free alloy will allow processing at approximately the
same temperature as the solder we use now. Once the choice of solder alloys is
made, we will be running a series of processing tests to assure the best possible
coverage and surface characteristics. The length of this testing is entirely
dependent upon meeting the required quality levels, although we do not anticipate
any major issues in this area. |
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